Use CMake string(TIMESTAMP) for portable compile timestamp #190
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The previous usage of the date command is not portable across different platforms. date is not guaranteed to be available and the format varies.
Replace it with CMake's built-in string(TIMESTAMP) command which generates a string with the given timestamp format independent of the platform. This commit changes it to use "%y%m%d" format for a YYMMDD timestamp commonly used for compilation.